Boiler.



No. 688,053. Patented Dec. 3, 1901. .1. H. ARRASMITH.

BOILER.

(Afiplication fi1 ed Apr. 19, 1901.

(No Model.)

WITNESSES '9" 2 //v VENTOI? m: NORRIS PETERS can wcnmumuu wnsmusw. n. c

NTTEE STATES PATENT OFFICE.

JAMES HENRY ARRASMITH, OF COLFAX, WASHINGTON.

BOILER.

SPECIFICATION forming part of Letters Patent No. 688,053, dated December 1- Applioation filed April 19, 1901. Serial No, 56,577. (No model.)

To ctZZ whmn it may concern:

Be it known that 1, JAMES HENRY ARRA- SMITH, a citizen of the United States, and a resident of Colfax, in the county of Whitman and State of Washington, have invented a new and Improved Boiler, of which the following is a full, clear, and exact description.

This invention relates to a direct-flu e steamboiler designed principally for use in connection with straw fuel. These boilers are usually employed for agricultural purposes, such as for supplying the engines which drive threshing-machines, straw being employed as fuel owing to its economy.

This specification is a specific description of one form of the invention,while the claims are definitions of the actual scope thereof.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in both views.

Figure 1 is a sectional view of the invention on the line 1 1 of Fig. 2, and Fig. 2 is a section on the line 2 2 of Fig. 1.

a indicates the fire-box, and b indicates the fire-tubes. These tubes b are extended rearward over the fire-box and terminate adjacent to the rear wall thereof, the tube-sheet a lying in an inclined position, so as to facilitate the passage of the burning gases from the grate rearward and thence into the tubes.

61 indicates a baffle-plate which is hingedly mounted just below the tubes and adjustable to regulate the passage of the draft.

e and e indicate the crown-sheets, the part c of which is the major portion and lies below the fire-tubes. The part e is the minor portion, and this arrangement reduces to the minimum the liability of burning out the crown-sheets. This construction enables the boiler to hold more water than others of the same exterior dimensions, and by the extension of the tubes more heating-surface is obtained. Further, the arrangement described insures an effective draft and thorough combustion.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A steam-boiler having a fire-box and firetubes, the fire-tubes being extended rearward over the fire-box to the rear portion thereof, the tube-sheet at the rear portion of the fire box inclining upwardly and rearwardly, for the purpose specified.

2. A steam-boiler having a fire-box, firetubes extended rearward over the fire-box, a tube-sheet lying in an inclined position over the rear portion of the fire-box, crown-sheets in major and minor sections, the major of which is below the fire-tubes, and a baffleplate hingedly mounted below thetubes, sub stantially as described.

3. A steam-boiler having a fire-box, firetubes extended rearward over the fire-box, a tube-sheet lying in an inclined position over the rear portion of the fire-box, and a baffleplate hinged below the tubes for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES HENRY ARRASMITH.

Witnesses:

OSCAR JOEL CowE, BENJAMIN F. NEWMAN. 

